title: Production and secretion in Escherichia coli of hepatitis B virus pre-S2 antigen as fusion proteins with beta-lactamase.
abstract: The diagnostically important surface antigen pre-S2 of hepatitis B virus was produced in large amounts in the periplasmic space of Escherichia coli. The DNA fragments (pre-S2) coding the pre-S2 antigen were tandemly duplicated or triplicated and ligated in the same reading frame to a fragment containing the promoter and the signal sequence of the alkaline phosphatase-coding gene (phoA) of E. coli. Further, a DNA fragment (bla) coding mature beta-lactamase was joined to the region coding the C terminus of the pre-S2 repeat to stabilize the gene product. Upon induction of the phoA-(pre-S2)3-bla fusion gene, the fusion protein was produced at up to 30% of the total cellular protein. Fractionation of the cellular components and trypsin accessibility of the product showed that the antigen was secreted in the periplasm and formed inclusion bodies there. The signal sequence of alkaline phosphatase was found to be correctly processed in E. coli.
authors.affiliation: Department of Agricultural Chemistry, University of Tokyo, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Kadokura
authors.forename: K
authors.initials: K
authors.lastname: Yoda
authors.forename: M
authors.initials: M
authors.lastname: Imai
authors.forename: M
authors.initials: M
authors.lastname: Yamasaki
mesh_terms: D000595:Amino Acid Sequence; D000956:Antigens, Viral / Q000096:biosynthesis / Q000235:genetics* / Q000378:metabolism; D001483:Base Sequence; D004279:DNA, Viral / Q000235:genetics; D004926:Escherichia coli / Q000235:genetics; D015870:Gene Expression; D006514:Hepatitis B Surface Antigens / Q000096:biosynthesis / Q000235:genetics* / Q000378:metabolism; D006515:Hepatitis B virus / Q000235:genetics* / Q000276:immunology; D008969:Molecular Sequence Data; D011498:Protein Precursors / Q000096:biosynthesis / Q000235:genetics* / Q000378:metabolism; D011993:Recombinant Fusion Proteins / Q000096:biosynthesis / Q000235:genetics / Q000378:metabolism; D001618:beta-Lactamases / Q000235:genetics
chemical_list: D000956:Antigens, Viral; D004279:DNA, Viral; D006514:Hepatitis B Surface Antigens; D011498:Protein Precursors; D011993:Recombinant Fusion Proteins; C050807:presurface protein 2, hepatitis B surface antigen; D001618:beta-Lactamases